Climatology of the United States. 247 
On page 182 Mr. Blodget says, “The great winter storms are 
special proofs of the uniformity of the field over which the mass 
of our atmosphere, and the elements of heat, moisture, and per- 
magnetism which move it, pass through their succession of 
changes.” If Mr. Blodget can show any necessary connexion 
ween our winter storms and the phenomena of terrestrial 
magnetism, he will make a positive addition to the science of 
Meteorology, and will have done something to show that storms 
are subject to laws. 
On page 380 he says, “In the colder months the change of 
condition, both as regards temperature and the quantity of 
queous vapor suspended, affects the whole mass in greater 
degree than when the rain is deposited in showers. For this 
Teason the range of the barometer is greater, and this range is a 
very direct measure of the relative condition, so that the readings 
may be taken as simple representatives of the quantity of heat and 
mosiure present compared with the average.” Mr. get here 
seems to advance the doctrine that the oscillations of the barom- 
tier which are so common in winter are adequately explained by 
changes in the temperature of the air and in the amount of 
queous vapor. If this is Mr. Blodget’s view, we differ from him 
totally, Changes in the temperature. of the air and in the 
amount of aqueous vapor, would doubtless cause changes in the 
height of the barometer; but these causes are 2 
explain the actually observed oscillations of the barometer, In 
Some pers of England the observed range of the barometer is 
Nicahes the barometer has been observed to fall about two inches 
Perature or moisture will account for such extreme oscillations 
of the barometer. Moreover it is not uncommon in Europe for 
fall of the barometer to be accompanied by a fall of the ther- 
Mometer; so that the barometer may even fall in spite of an in- 
eased specific gravity of the air. ; 
toe wea sum up our judgment of the Climatol- 
gy in a single sentence. The field which Mr. Blodget has 
ag is a new one, and portions of it have hitherto been 
who ly unexplored—Mr. Blodget has enjoyed unusual advanta- 
